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[Xen-devel] USB2.0 disk format failure in windows guest



Hi all,

We pass-throughed USB 2.0 disk to guest using usb-host (qemu option: -usb -device usb-ehci,id=ehci -device usb-host,bus=ehci.0,hostbus=2,hostaddr=1) on xen-4.2.0 and qemu-1.2.2 (also try it on qemu 1.4.0) , it worked fine for reading and writing data, but failed when format it in a windows Guest OS such as winXP,win7,win2003. We captured usb operations on Dom0, found below logs:

  ...

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325169] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325172] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.325176] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326757] usb 6-1: urb complete

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326761] usb 6-1: userurb 00007fa196d04b10, ep2 bulk-out, actual_length 4096 status 0

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326780] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:17:50 linux-bLKBXy kernel: [66642.326787] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY    --- stuck here about one minute

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289239] usb 6-1: usbdev_do_ioctl: DISCARDURB             --- received a DISCARD instruction

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289398] usb 6-1: urb complete

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289403] usb 6-1: userurb 00007fa196d04d00, ep2 bulk-out, actual_length 512 status -2     

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289437] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.289450] usb 6-1: usbdev_do_ioctl: REAPURBNDELAY

Feb  1 11:18:50 linux-bLKBXy kernel: [66702.428985] usb 6-1: usbdev_do_ioctl: RESET                             -- received a reset instruction to retry

 

We are wondering why the usb operation will be stuck one minute and then DISCARD instruction was issued. Was DISCARD instruction triggered by a time out in format software? Any ideas?  Thanks.

BTW, a usb format tool diskgenius ( http://www.diskgenius.cn/ ) can format the pass-throughed USB 2.0 device successfully in windows guest. In addition, Linux guests don't have this issue. Looks software will use different way to format a USB disk. We attached usb operation logs: 1) windows format log (failure) 2) diskgenius format log (success) 3) linux guest format (success)

 

-Gonglei

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